Burglar-alarm



(No Model.)

W. -H. REIFP.

BURGLAB ALARM.

Patented Apr..29

N. PETERS, Pholoulhugnphnr, wmm

UNITED STATES PATENT OFFICE.

WILLIAM H. REIFF, ,OF PHILADELPHIA, PENNSYLVANIA.

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 297,632, dated April 29, 1884.

Application filed February 11, 1884. (No model.)

To all whom it may concern.-

Be it known that. 1, WILLIAM H. REIFF, of the city of Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented an Improvement in Burglar-Alarms, of which the following is a specification.

My invention has reference to burglaralarms, and it consists incertain improvements fully set forth in the following specification, and shown in the accompanying drawings, which form part thereof.

The object of this invention is a provide a suitable, cheap, and effective burglar-alarm adapted to explode a cartridge upon the attempt to open a door, &c.

p In the drawings, Figure 1 is a sectional elevation of the alarm set for the night. Fig; 2 is an enlarged bottom view of same. Fig. 3

is a cross-section of Fig. 1 on line 00 x, and Fig.-

4 is a' cross-section on line y y.

A is a cylinder, with the solid portion B at the bottom, which forms the weight to make the alarm fall right side up, and also the anvil for the cartridge D, which is placed in a hole, 0,

passing through said solid part B. The upper end of the cylinder A is closed by a screw-cap, E, which may be screwed on or off for'the removal of the products from the discharged cartridge. The cylinder Ais also perforated with two rows of holes, F, near its top, to allow of escape of the smoke and noise, which is loud, owing to the use of a hollow cylinder, A. The

wad from the cartridge strikes the head or cap E, and is then consumed within the cylinder, and is thus prevented from communicating fire to surrounding objects. An eye, 6, is secured to the cap E, and to said eye is secured a chain,

L, having a ring, M, 011 the top, which may.

be hung over the end of a wooden arm, N, supported from between the frame 0 and door I? in the usual way. This arm N is notched on both ends, as at N, the notch on one end be-' ing deeper than the other, so that either end may be turned to suit cracks or spaces of different widths. The door pushes upon the offset of the notch and dislodges the arm N when opened. The lower edge of part B has two lugs, 1), between which is hinged the hammer G by a lug and pin, G. This hammer G is made narrow, flat on the top, and rounded or curved on the bottom, and is provided with the steel point H, which explodes the cap.

annoyance of the hammer falling shut. round bottom of the hammer causes it to ex- I is a steel or other metal spring to hold the hammer either open orclosed, and setsin' a longitudinalgroove or recess, K, made in the cylinder and part B, the said groove terminating between the lugs b and forming the sides or projections K, which prevent any lateral displacement of said spring I, and enable it to be secured in place by one screw or rivet, J. This spring I presses upon the lug of the hammer G, which lug has two flattened facets, g g, arranged at right angles to each upon face and allows the alarm to be handled for the removal of the discharged cartridge and insertion of a fresh one without the The plode the cartridge positively. If it were flat and struck on the hinged end, it might not go off, and by making it narrow it is easily caught by the fingers and opened. These various details of construction enable the alarm as a whole to be made cheap and accomplish all the desired effects with a positive action and prevent its getting out of order.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

In a burglar-alarm, the cylinder A, having solid part B, with a hole, 0, lugs b b, and groove K at the bottom, and with apertures F at the top, in combination with cap E, hinged hammer G, having pin H, and faces 9 g at right angles to each other and on the hinge, and a spring, I, the end of which presses on the faces 9 g, to hold the hammer open or closed, and

kept from displacement by lugs b b and groove K, between which it Works, substantially as and for the purpose specified.

B. M. HUNTER, ISAIAH MATLAcK. 

